Being a relatively powerful big V-twin, the Raptor has aggressive cam profiles & is therefore very sensitive to TPS setting & throttle body synch at low RPM/small throttle openings. There's a very specific routine for setting them, detailed in a 'tuning supplement' issued by Suzuki shortly after the TLS was released. However to access the vacuum ports, you have to remove the airbox. So the instructions say remove it, set the TPS & balancing, then replace the airbox & Bob's yer uncle. Fine, did that on mine & it was a vast improvement (riding at walking pace was impossible before). But I can't help thinking the airbox & filter must affect the airflow to the throttle bodies, & very possibly allow less air to one of them. So to get the balance absolutely spot on, one should replace the airbox & filter after fitting the balancer hoses to the vacuum ports & then synch them. Yay or nay?
